fs/ufs/inode.c

   1 /*
   2  *  linux/fs/ufs/inode.c
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  *
   8  *  from
   9  *
  10  *  linux/fs/ext2/inode.c
  11  *
  12  * Copyright (C) 1992, 1993, 1994, 1995
  13  * Remy Card (card@masi.ibp.fr)
  14  * Laboratoire MASI - Institut Blaise Pascal
  15  * Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *  from
  18  *
  19  *  linux/fs/minix/inode.c
  20  *
  21  *  Copyright (C) 1991, 1992  Linus Torvalds
  22  *
  23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  24  *  Big-endian to little-endian byte-swapping/bitmaps by
  25  *        David S. Miller (davem@caip.rutgers.edu), 1995
  26  */
  27
  28 #include <linux/uaccess.h>
  29
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/time.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38
  39 #include "ufs_fs.h"
  40 #include "ufs.h"
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  45 {
  46         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  47         int ptrs = uspi->s_apb;
  48         int ptrs_bits = uspi->s_apbshift;
  49         const long direct_blocks = UFS_NDADDR,
  50                 indirect_blocks = ptrs,
  51                 double_blocks = (1 << (ptrs_bits * 2));
  52         int n = 0;
  53
  54
  55         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  56         if (i_block < direct_blocks) {
  57                 offsets[n++] = i_block;
  58         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  59                 offsets[n++] = UFS_IND_BLOCK;
  60                 offsets[n++] = i_block;
  61         } else if ((i_block -= indirect_blocks) < double_blocks) {
  62                 offsets[n++] = UFS_DIND_BLOCK;
  63                 offsets[n++] = i_block >> ptrs_bits;
  64                 offsets[n++] = i_block & (ptrs - 1);
  65         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  66                 offsets[n++] = UFS_TIND_BLOCK;
  67                 offsets[n++] = i_block >> (ptrs_bits * 2);
  68                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  69                 offsets[n++] = i_block & (ptrs - 1);
  70         } else {
  71                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  72         }
  73         return n;
  74 }
  75
  76 typedef struct {
  77         void    *p;
  78         union {
  79                 __fs32  key32;
  80                 __fs64  key64;
  81         };
  82         struct buffer_head *bh;
  83 } Indirect;
  84
  85 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  86                                struct buffer_head *bh, __fs32 *v,
  87                                Indirect *from, Indirect *to)
  88 {
  89         Indirect *p;
  90         unsigned seq;
  91         to->bh = bh;
  92         do {
  93                 seq = read_seqbegin(&ufsi->meta_lock);
  94                 to->key32 = *(__fs32 *)(to->p = v);
  95                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  96                         ;
  97         } while (read_seqretry(&ufsi->meta_lock, seq));
  98         return (p > to);
  99 }
 100
 101 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 102                                struct buffer_head *bh, __fs64 *v,
 103                                Indirect *from, Indirect *to)
 104 {
 105         Indirect *p;
 106         unsigned seq;
 107         to->bh = bh;
 108         do {
 109                 seq = read_seqbegin(&ufsi->meta_lock);
 110                 to->key64 = *(__fs64 *)(to->p = v);
 111                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 112                         ;
 113         } while (read_seqretry(&ufsi->meta_lock, seq));
 114         return (p > to);
 115 }
 116
 117 /*
 118  * Returns the location of the fragment from
 119  * the beginning of the filesystem.
 120  */
 121
 122 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 123 {
 124         struct ufs_inode_info *ufsi = UFS_I(inode);
 125         struct super_block *sb = inode->i_sb;
 126         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 127         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 128         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 129         Indirect chain[4], *q = chain;
 130         unsigned *p;
 131         unsigned flags = UFS_SB(sb)->s_flags;
 132         u64 res = 0;
 133
 134         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 135                 uspi->s_fpbshift, uspi->s_apbmask,
 136                 (unsigned long long)mask);
 137
 138         if (depth == 0)
 139                 goto no_block;
 140
 141 again:
 142         p = offsets;
 143
 144         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 145                 goto ufs2;
 146
 147         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 148                 goto changed;
 149         if (!q->key32)
 150                 goto no_block;
 151         while (--depth) {
 152                 __fs32 *ptr;
 153                 struct buffer_head *bh;
 154                 unsigned n = *p++;
 155
 156                 bh = sb_bread(sb, uspi->s_sbbase +
 157                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 158                 if (!bh)
 159                         goto no_block;
 160                 ptr = (__fs32 *)bh->b_data + (n & mask);
 161                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 162                         goto changed;
 163                 if (!q->key32)
 164                         goto no_block;
 165         }
 166         res = fs32_to_cpu(sb, q->key32);
 167         goto found;
 168
 169 ufs2:
 170         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 171                 goto changed;
 172         if (!q->key64)
 173                 goto no_block;
 174
 175         while (--depth) {
 176                 __fs64 *ptr;
 177                 struct buffer_head *bh;
 178                 unsigned n = *p++;
 179
 180                 bh = sb_bread(sb, uspi->s_sbbase +
 181                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 182                 if (!bh)
 183                         goto no_block;
 184                 ptr = (__fs64 *)bh->b_data + (n & mask);
 185                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 186                         goto changed;
 187                 if (!q->key64)
 188                         goto no_block;
 189         }
 190         res = fs64_to_cpu(sb, q->key64);
 191 found:
 192         res += uspi->s_sbbase;
 193 no_block:
 194         while (q > chain) {
 195                 brelse(q->bh);
 196                 q--;
 197         }
 198         return res;
 199
 200 changed:
 201         while (q > chain) {
 202                 brelse(q->bh);
 203                 q--;
 204         }
 205         goto again;
 206 }
 207
 208 /*
 209  * Unpacking tails: we have a file with partial final block and
 210  * we had been asked to extend it.  If the fragment being written
 211  * is within the same block, we need to extend the tail just to cover
 212  * that fragment.  Otherwise the tail is extended to full block.
 213  *
 214  * Note that we might need to create a _new_ tail, but that will
 215  * be handled elsewhere; this is strictly for resizing old
 216  * ones.
 217  */
 218 static bool
 219 ufs_extend_tail(struct inode *inode, u64 writes_to,
 220                   int *err, struct page *locked_page)
 221 {
 222         struct ufs_inode_info *ufsi = UFS_I(inode);
 223         struct super_block *sb = inode->i_sb;
 224         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 225         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 226         unsigned block = ufs_fragstoblks(lastfrag);
 227         unsigned new_size;
 228         void *p;
 229         u64 tmp;
 230
 231         if (writes_to < (lastfrag | uspi->s_fpbmask))
 232                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 233         else
 234                 new_size = uspi->s_fpb;
 235
 236         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 237         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 238                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 239                                 locked_page);
 240         return tmp != 0;
 241 }
 242
 243 /**
 244  * ufs_inode_getfrag() - allocate new fragment(s)
 245  * @inode: pointer to inode
 246  * @index: number of block pointer within the inode's array.
 247  * @new_fragment: number of new allocated fragment(s)
 248  * @err: we set it if something wrong
 249  * @new: we set it if we allocate new block
 250  * @locked_page: for ufs_new_fragments()
 251  */
 252 static u64
 253 ufs_inode_getfrag(struct inode *inode, unsigned index,
 254                   sector_t new_fragment, int *err,
 255                   int *new, struct page *locked_page)
 256 {
 257         struct ufs_inode_info *ufsi = UFS_I(inode);
 258         struct super_block *sb = inode->i_sb;
 259         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 260         u64 tmp, goal, lastfrag;
 261         unsigned nfrags = uspi->s_fpb;
 262         void *p;
 263
 264         /* TODO : to be done for write support
 265         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 266              goto ufs2;
 267          */
 268
 269         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 270         tmp = ufs_data_ptr_to_cpu(sb, p);
 271         if (tmp)
 272                 goto out;
 273
 274         lastfrag = ufsi->i_lastfrag;
 275
 276         /* will that be a new tail? */
 277         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 278                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 279
 280         goal = 0;
 281         if (index) {
 282                 goal = ufs_data_ptr_to_cpu(sb,
 283                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 284                 if (goal)
 285                         goal += uspi->s_fpb;
 286         }
 287         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 288                                 goal, nfrags, err, locked_page);
 289
 290         if (!tmp) {
 291                 *err = -ENOSPC;
 292                 return 0;
 293         }
 294
 295         if (new)
 296                 *new = 1;
 297         inode->i_ctime = current_time(inode);
 298         if (IS_SYNC(inode))
 299                 ufs_sync_inode (inode);
 300         mark_inode_dirty(inode);
 301 out:
 302         return tmp + uspi->s_sbbase;
 303
 304      /* This part : To be implemented ....
 305         Required only for writing, not required for READ-ONLY.
 306 ufs2:
 307
 308         u2_block = ufs_fragstoblks(fragment);
 309         u2_blockoff = ufs_fragnum(fragment);
 310         p = ufsi->i_u1.u2_i_data + block;
 311         goal = 0;
 312
 313 repeat2:
 314         tmp = fs32_to_cpu(sb, *p);
 315         lastfrag = ufsi->i_lastfrag;
 316
 317      */
 318 }
 319
 320 /**
 321  * ufs_inode_getblock() - allocate new block
 322  * @inode: pointer to inode
 323  * @ind_block: block number of the indirect block
 324  * @index: number of pointer within the indirect block
 325  * @new_fragment: number of new allocated fragment
 326  *  (block will hold this fragment and also uspi->s_fpb-1)
 327  * @err: see ufs_inode_getfrag()
 328  * @new: see ufs_inode_getfrag()
 329  * @locked_page: see ufs_inode_getfrag()
 330  */
 331 static u64
 332 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 333                   unsigned index, sector_t new_fragment, int *err,
 334                   int *new, struct page *locked_page)
 335 {
 336         struct super_block *sb = inode->i_sb;
 337         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 338         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 339         u64 tmp = 0, goal;
 340         struct buffer_head *bh;
 341         void *p;
 342
 343         if (!ind_block)
 344                 return 0;
 345
 346         bh = sb_bread(sb, ind_block + (index >> shift));
 347         if (unlikely(!bh)) {
 348                 *err = -EIO;
 349                 return 0;
 350         }
 351
 352         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 353         if (uspi->fs_magic == UFS2_MAGIC)
 354                 p = (__fs64 *)bh->b_data + index;
 355         else
 356                 p = (__fs32 *)bh->b_data + index;
 357
 358         tmp = ufs_data_ptr_to_cpu(sb, p);
 359         if (tmp)
 360                 goto out;
 361
 362         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 363                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 364                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 365                 goal = tmp + uspi->s_fpb;
 366         else
 367                 goal = bh->b_blocknr + uspi->s_fpb;
 368         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 369                                 uspi->s_fpb, err, locked_page);
 370         if (!tmp)
 371                 goto out;
 372
 373         if (new)
 374                 *new = 1;
 375
 376         mark_buffer_dirty(bh);
 377         if (IS_SYNC(inode))
 378                 sync_dirty_buffer(bh);
 379         inode->i_ctime = current_time(inode);
 380         mark_inode_dirty(inode);
 381 out:
 382         brelse (bh);
 383         UFSD("EXIT\n");
 384         if (tmp)
 385                 tmp += uspi->s_sbbase;
 386         return tmp;
 387 }
 388
 389 /**
 390  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 391  * readpage, writepage and so on
 392  */
 393
 394 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 395 {
 396         struct super_block *sb = inode->i_sb;
 397         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 398         int err = 0, new = 0;
 399         unsigned offsets[4];
 400         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 401         u64 phys64 = 0;
 402         unsigned frag = fragment & uspi->s_fpbmask;
 403
 404         phys64 = ufs_frag_map(inode, offsets, depth);
 405         if (!create)
 406                 goto done;
 407
 408         if (phys64) {
 409                 if (fragment >= UFS_NDIR_FRAGMENT)
 410                         goto done;
 411                 read_seqlock_excl(&UFS_I(inode)->meta_lock);
 412                 if (fragment < UFS_I(inode)->i_lastfrag) {
 413                         read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 414                         goto done;
 415                 }
 416                 read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 417         }
 418         /* This code entered only while writing ....? */
 419
 420         mutex_lock(&UFS_I(inode)->truncate_mutex);
 421
 422         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 423         if (unlikely(!depth)) {
 424                 ufs_warning(sb, "ufs_get_block", "block > big");
 425                 err = -EIO;
 426                 goto out;
 427         }
 428
 429         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 430                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 431                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 432                 if (tailfrags && fragment >= lastfrag) {
 433                         if (!ufs_extend_tail(inode, fragment,
 434                                              &err, bh_result->b_page))
 435                                 goto out;
 436                 }
 437         }
 438
 439         if (depth == 1) {
 440                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 441                                            &err, &new, bh_result->b_page);
 442         } else {
 443                 int i;
 444                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 445                                            &err, NULL, NULL);
 446                 for (i = 1; i < depth - 1; i++)
 447                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 448                                                 fragment, &err, NULL, NULL);
 449                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 450                                         fragment, &err, &new, bh_result->b_page);
 451         }
 452 out:
 453         if (phys64) {
 454                 phys64 += frag;
 455                 map_bh(bh_result, sb, phys64);
 456                 if (new)
 457                         set_buffer_new(bh_result);
 458         }
 459         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 460         return err;
 461
 462 done:
 463         if (phys64)
 464                 map_bh(bh_result, sb, phys64 + frag);
 465         return 0;
 466 }
 467
 468 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 469 {
 470         return block_write_full_page(page,ufs_getfrag_block,wbc);
 471 }
 472
 473 static int ufs_readpage(struct file *file, struct page *page)
 474 {
 475         return block_read_full_page(page,ufs_getfrag_block);
 476 }
 477
 478 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 479 {
 480         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 481 }
 482
 483 static void ufs_truncate_blocks(struct inode *);
 484
 485 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 486 {
 487         struct inode *inode = mapping->host;
 488
 489         if (to > inode->i_size) {
 490                 truncate_pagecache(inode, inode->i_size);
 491                 ufs_truncate_blocks(inode);
 492         }
 493 }
 494
 495 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 496                         loff_t pos, unsigned len, unsigned flags,
 497                         struct page **pagep, void **fsdata)
 498 {
 499         int ret;
 500
 501         ret = block_write_begin(mapping, pos, len, flags, pagep,
 502                                 ufs_getfrag_block);
 503         if (unlikely(ret))
 504                 ufs_write_failed(mapping, pos + len);
 505
 506         return ret;
 507 }
 508
 509 static int ufs_write_end(struct file *file, struct address_space *mapping,
 510                         loff_t pos, unsigned len, unsigned copied,
 511                         struct page *page, void *fsdata)
 512 {
 513         int ret;
 514
 515         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 516         if (ret < len)
 517                 ufs_write_failed(mapping, pos + len);
 518         return ret;
 519 }
 520
 521 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 522 {
 523         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 524 }
 525
 526 const struct address_space_operations ufs_aops = {
 527         .readpage = ufs_readpage,
 528         .writepage = ufs_writepage,
 529         .write_begin = ufs_write_begin,
 530         .write_end = ufs_write_end,
 531         .bmap = ufs_bmap
 532 };
 533
 534 static void ufs_set_inode_ops(struct inode *inode)
 535 {
 536         if (S_ISREG(inode->i_mode)) {
 537                 inode->i_op = &ufs_file_inode_operations;
 538                 inode->i_fop = &ufs_file_operations;
 539                 inode->i_mapping->a_ops = &ufs_aops;
 540         } else if (S_ISDIR(inode->i_mode)) {
 541                 inode->i_op = &ufs_dir_inode_operations;
 542                 inode->i_fop = &ufs_dir_operations;
 543                 inode->i_mapping->a_ops = &ufs_aops;
 544         } else if (S_ISLNK(inode->i_mode)) {
 545                 if (!inode->i_blocks) {
 546                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 547                         inode->i_op = &simple_symlink_inode_operations;
 548                 } else {
 549                         inode->i_mapping->a_ops = &ufs_aops;
 550                         inode->i_op = &page_symlink_inode_operations;
 551                         inode_nohighmem(inode);
 552                 }
 553         } else
 554                 init_special_inode(inode, inode->i_mode,
 555                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 556 }
 557
 558 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 559 {
 560         struct ufs_inode_info *ufsi = UFS_I(inode);
 561         struct super_block *sb = inode->i_sb;
 562         umode_t mode;
 563
 564         /*
 565          * Copy data to the in-core inode.
 566          */
 567         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 568         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 569         if (inode->i_nlink == 0) {
 570                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 571                 return -1;
 572         }
 573
 574         /*
 575          * Linux now has 32-bit uid and gid, so we can support EFT.
 576          */
 577         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 578         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 579
 580         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 581         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 582         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 583         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 584         inode->i_mtime.tv_nsec = 0;
 585         inode->i_atime.tv_nsec = 0;
 586         inode->i_ctime.tv_nsec = 0;
 587         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 588         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 589         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 590         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 591         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 592
 593
 594         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 595                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 596                        sizeof(ufs_inode->ui_u2.ui_addr));
 597         } else {
 598                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 599                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 600                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 601         }
 602         return 0;
 603 }
 604
 605 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 606 {
 607         struct ufs_inode_info *ufsi = UFS_I(inode);
 608         struct super_block *sb = inode->i_sb;
 609         umode_t mode;
 610
 611         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 612         /*
 613          * Copy data to the in-core inode.
 614          */
 615         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 616         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 617         if (inode->i_nlink == 0) {
 618                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 619                 return -1;
 620         }
 621
 622         /*
 623          * Linux now has 32-bit uid and gid, so we can support EFT.
 624          */
 625         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 626         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 627
 628         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 629         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 630         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 631         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 632         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 633         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 634         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 635         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 636         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 637         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 638         /*
 639         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 640         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 641         */
 642
 643         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 644                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 645                        sizeof(ufs2_inode->ui_u2.ui_addr));
 646         } else {
 647                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 648                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 649                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 650         }
 651         return 0;
 652 }
 653
 654 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 655 {
 656         struct ufs_inode_info *ufsi;
 657         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 658         struct buffer_head * bh;
 659         struct inode *inode;
 660         int err;
 661
 662         UFSD("ENTER, ino %lu\n", ino);
 663
 664         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 665                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 666                             ino);
 667                 return ERR_PTR(-EIO);
 668         }
 669
 670         inode = iget_locked(sb, ino);
 671         if (!inode)
 672                 return ERR_PTR(-ENOMEM);
 673         if (!(inode->i_state & I_NEW))
 674                 return inode;
 675
 676         ufsi = UFS_I(inode);
 677
 678         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 679         if (!bh) {
 680                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 681                             inode->i_ino);
 682                 goto bad_inode;
 683         }
 684         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 685                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 686
 687                 err = ufs2_read_inode(inode,
 688                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 689         } else {
 690                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 691
 692                 err = ufs1_read_inode(inode,
 693                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 694         }
 695
 696         if (err)
 697                 goto bad_inode;
 698         inode->i_version++;
 699         ufsi->i_lastfrag =
 700                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 701         ufsi->i_dir_start_lookup = 0;
 702         ufsi->i_osync = 0;
 703
 704         ufs_set_inode_ops(inode);
 705
 706         brelse(bh);
 707
 708         UFSD("EXIT\n");
 709         unlock_new_inode(inode);
 710         return inode;
 711
 712 bad_inode:
 713         iget_failed(inode);
 714         return ERR_PTR(-EIO);
 715 }
 716
 717 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 718 {
 719         struct super_block *sb = inode->i_sb;
 720         struct ufs_inode_info *ufsi = UFS_I(inode);
 721
 722         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 723         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 724
 725         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 726         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 727
 728         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 729         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 730         ufs_inode->ui_atime.tv_usec = 0;
 731         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 732         ufs_inode->ui_ctime.tv_usec = 0;
 733         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 734         ufs_inode->ui_mtime.tv_usec = 0;
 735         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 736         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 737         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 738
 739         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 740                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 741                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 742         }
 743
 744         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 745                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 746                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 747         } else if (inode->i_blocks) {
 748                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 749                        sizeof(ufs_inode->ui_u2.ui_addr));
 750         }
 751         else {
 752                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 753                        sizeof(ufs_inode->ui_u2.ui_symlink));
 754         }
 755
 756         if (!inode->i_nlink)
 757                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 758 }
 759
 760 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 761 {
 762         struct super_block *sb = inode->i_sb;
 763         struct ufs_inode_info *ufsi = UFS_I(inode);
 764
 765         UFSD("ENTER\n");
 766         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 767         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 768
 769         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 770         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 771
 772         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 773         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 774         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 775         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 776         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 777         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 778         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 779
 780         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 781         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 782         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 783
 784         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 785                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 786                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 787         } else if (inode->i_blocks) {
 788                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 789                        sizeof(ufs_inode->ui_u2.ui_addr));
 790         } else {
 791                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 792                        sizeof(ufs_inode->ui_u2.ui_symlink));
 793         }
 794
 795         if (!inode->i_nlink)
 796                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 797         UFSD("EXIT\n");
 798 }
 799
 800 static int ufs_update_inode(struct inode * inode, int do_sync)
 801 {
 802         struct super_block *sb = inode->i_sb;
 803         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 804         struct buffer_head * bh;
 805
 806         UFSD("ENTER, ino %lu\n", inode->i_ino);
 807
 808         if (inode->i_ino < UFS_ROOTINO ||
 809             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 810                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 811                 return -1;
 812         }
 813
 814         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 815         if (!bh) {
 816                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 817                 return -1;
 818         }
 819         if (uspi->fs_magic == UFS2_MAGIC) {
 820                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 821
 822                 ufs2_update_inode(inode,
 823                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 824         } else {
 825                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 826
 827                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 828         }
 829
 830         mark_buffer_dirty(bh);
 831         if (do_sync)
 832                 sync_dirty_buffer(bh);
 833         brelse (bh);
 834
 835         UFSD("EXIT\n");
 836         return 0;
 837 }
 838
 839 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 840 {
 841         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 842 }
 843
 844 int ufs_sync_inode (struct inode *inode)
 845 {
 846         return ufs_update_inode (inode, 1);
 847 }
 848
 849 void ufs_evict_inode(struct inode * inode)
 850 {
 851         int want_delete = 0;
 852
 853         if (!inode->i_nlink && !is_bad_inode(inode))
 854                 want_delete = 1;
 855
 856         truncate_inode_pages_final(&inode->i_data);
 857         if (want_delete) {
 858                 inode->i_size = 0;
 859                 if (inode->i_blocks &&
 860                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 861                      S_ISLNK(inode->i_mode)))
 862                         ufs_truncate_blocks(inode);
 863                 ufs_update_inode(inode, inode_needs_sync(inode));
 864         }
 865
 866         invalidate_inode_buffers(inode);
 867         clear_inode(inode);
 868
 869         if (want_delete)
 870                 ufs_free_inode(inode);
 871 }
 872
 873 struct to_free {
 874         struct inode *inode;
 875         u64 to;
 876         unsigned count;
 877 };
 878
 879 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 880 {
 881         if (ctx->count && ctx->to != from) {
 882                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 883                 ctx->count = 0;
 884         }
 885         ctx->count += count;
 886         ctx->to = from + count;
 887 }
 888
 889 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 890
 891 static void ufs_trunc_direct(struct inode *inode)
 892 {
 893         struct ufs_inode_info *ufsi = UFS_I(inode);
 894         struct super_block * sb;
 895         struct ufs_sb_private_info * uspi;
 896         void *p;
 897         u64 frag1, frag2, frag3, frag4, block1, block2;
 898         struct to_free ctx = {.inode = inode};
 899         unsigned i, tmp;
 900
 901         UFSD("ENTER: ino %lu\n", inode->i_ino);
 902
 903         sb = inode->i_sb;
 904         uspi = UFS_SB(sb)->s_uspi;
 905
 906         frag1 = DIRECT_FRAGMENT;
 907         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 908         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 909         frag3 = frag4 & ~uspi->s_fpbmask;
 910         block1 = block2 = 0;
 911         if (frag2 > frag3) {
 912                 frag2 = frag4;
 913                 frag3 = frag4 = 0;
 914         } else if (frag2 < frag3) {
 915                 block1 = ufs_fragstoblks (frag2);
 916                 block2 = ufs_fragstoblks (frag3);
 917         }
 918
 919         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 920              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 921              (unsigned long long)frag1, (unsigned long long)frag2,
 922              (unsigned long long)block1, (unsigned long long)block2,
 923              (unsigned long long)frag3, (unsigned long long)frag4);
 924
 925         if (frag1 >= frag2)
 926                 goto next1;
 927
 928         /*
 929          * Free first free fragments
 930          */
 931         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 932         tmp = ufs_data_ptr_to_cpu(sb, p);
 933         if (!tmp )
 934                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 935         frag2 -= frag1;
 936         frag1 = ufs_fragnum (frag1);
 937
 938         ufs_free_fragments(inode, tmp + frag1, frag2);
 939
 940 next1:
 941         /*
 942          * Free whole blocks
 943          */
 944         for (i = block1 ; i < block2; i++) {
 945                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 946                 tmp = ufs_data_ptr_to_cpu(sb, p);
 947                 if (!tmp)
 948                         continue;
 949                 write_seqlock(&ufsi->meta_lock);
 950                 ufs_data_ptr_clear(uspi, p);
 951                 write_sequnlock(&ufsi->meta_lock);
 952
 953                 free_data(&ctx, tmp, uspi->s_fpb);
 954         }
 955
 956         free_data(&ctx, 0, 0);
 957
 958         if (frag3 >= frag4)
 959                 goto next3;
 960
 961         /*
 962          * Free last free fragments
 963          */
 964         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 965         tmp = ufs_data_ptr_to_cpu(sb, p);
 966         if (!tmp )
 967                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 968         frag4 = ufs_fragnum (frag4);
 969         write_seqlock(&ufsi->meta_lock);
 970         ufs_data_ptr_clear(uspi, p);
 971         write_sequnlock(&ufsi->meta_lock);
 972
 973         ufs_free_fragments (inode, tmp, frag4);
 974  next3:
 975
 976         UFSD("EXIT: ino %lu\n", inode->i_ino);
 977 }
 978
 979 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 980 {
 981         struct super_block *sb = inode->i_sb;
 982         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 983         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 984         unsigned i;
 985
 986         if (!ubh)
 987                 return;
 988
 989         if (--depth) {
 990                 for (i = 0; i < uspi->s_apb; i++) {
 991                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 992                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 993                         if (block)
 994                                 free_full_branch(inode, block, depth);
 995                 }
 996         } else {
 997                 struct to_free ctx = {.inode = inode};
 998
 999                 for (i = 0; i < uspi->s_apb; i++) {
1000                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1001                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1002                         if (block)
1003                                 free_data(&ctx, block, uspi->s_fpb);
1004                 }
1005                 free_data(&ctx, 0, 0);
1006         }
1007
1008         ubh_bforget(ubh);
1009         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1010 }
1011
1012 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1013 {
1014         struct super_block *sb = inode->i_sb;
1015         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1016         unsigned i;
1017
1018         if (--depth) {
1019                 for (i = from; i < uspi->s_apb ; i++) {
1020                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1021                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1022                         if (block) {
1023                                 write_seqlock(&UFS_I(inode)->meta_lock);
1024                                 ufs_data_ptr_clear(uspi, p);
1025                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1026                                 ubh_mark_buffer_dirty(ubh);
1027                                 free_full_branch(inode, block, depth);
1028                         }
1029                 }
1030         } else {
1031                 struct to_free ctx = {.inode = inode};
1032
1033                 for (i = from; i < uspi->s_apb; i++) {
1034                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1035                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1036                         if (block) {
1037                                 write_seqlock(&UFS_I(inode)->meta_lock);
1038                                 ufs_data_ptr_clear(uspi, p);
1039                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1040                                 ubh_mark_buffer_dirty(ubh);
1041                                 free_data(&ctx, block, uspi->s_fpb);
1042                         }
1043                 }
1044                 free_data(&ctx, 0, 0);
1045         }
1046         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1047                 ubh_sync_block(ubh);
1048         ubh_brelse(ubh);
1049 }
1050
1051 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1052 {
1053         int err = 0;
1054         struct super_block *sb = inode->i_sb;
1055         struct address_space *mapping = inode->i_mapping;
1056         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1057         unsigned i, end;
1058         sector_t lastfrag;
1059         struct page *lastpage;
1060         struct buffer_head *bh;
1061         u64 phys64;
1062
1063         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1064
1065         if (!lastfrag)
1066                 goto out;
1067
1068         lastfrag--;
1069
1070         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1071                                        (PAGE_SHIFT - inode->i_blkbits));
1072        if (IS_ERR(lastpage)) {
1073                err = -EIO;
1074                goto out;
1075        }
1076
1077        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1078        bh = page_buffers(lastpage);
1079        for (i = 0; i < end; ++i)
1080                bh = bh->b_this_page;
1081
1082
1083        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1084
1085        if (unlikely(err))
1086                goto out_unlock;
1087
1088        if (buffer_new(bh)) {
1089                clear_buffer_new(bh);
1090                clean_bdev_bh_alias(bh);
1091                /*
1092                 * we do not zeroize fragment, because of
1093                 * if it maped to hole, it already contains zeroes
1094                 */
1095                set_buffer_uptodate(bh);
1096                mark_buffer_dirty(bh);
1097                set_page_dirty(lastpage);
1098        }
1099
1100        if (lastfrag >= UFS_IND_FRAGMENT) {
1101                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1102                phys64 = bh->b_blocknr + 1;
1103                for (i = 0; i < end; ++i) {
1104                        bh = sb_getblk(sb, i + phys64);
1105                        lock_buffer(bh);
1106                        memset(bh->b_data, 0, sb->s_blocksize);
1107                        set_buffer_uptodate(bh);
1108                        mark_buffer_dirty(bh);
1109                        unlock_buffer(bh);
1110                        sync_dirty_buffer(bh);
1111                        brelse(bh);
1112                }
1113        }
1114 out_unlock:
1115        ufs_put_locked_page(lastpage);
1116 out:
1117        return err;
1118 }
1119
1120 static void ufs_truncate_blocks(struct inode *inode)
1121 {
1122         struct ufs_inode_info *ufsi = UFS_I(inode);
1123         struct super_block *sb = inode->i_sb;
1124         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1125         unsigned offsets[4];
1126         int depth;
1127         int depth2;
1128         unsigned i;
1129         struct ufs_buffer_head *ubh[3];
1130         void *p;
1131         u64 block;
1132
1133         if (inode->i_size) {
1134                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1135                 depth = ufs_block_to_path(inode, last, offsets);
1136                 if (!depth)
1137                         return;
1138         } else {
1139                 depth = 1;
1140         }
1141
1142         for (depth2 = depth - 1; depth2; depth2--)
1143                 if (offsets[depth2] != uspi->s_apb - 1)
1144                         break;
1145
1146         mutex_lock(&ufsi->truncate_mutex);
1147         if (depth == 1) {
1148                 ufs_trunc_direct(inode);
1149                 offsets[0] = UFS_IND_BLOCK;
1150         } else {
1151                 /* get the blocks that should be partially emptied */
1152                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1153                 for (i = 0; i < depth2; i++) {
1154                         block = ufs_data_ptr_to_cpu(sb, p);
1155                         if (!block)
1156                                 break;
1157                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1158                         if (!ubh[i]) {
1159                                 write_seqlock(&ufsi->meta_lock);
1160                                 ufs_data_ptr_clear(uspi, p);
1161                                 write_sequnlock(&ufsi->meta_lock);
1162                                 break;
1163                         }
1164                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1165                 }
1166                 while (i--)
1167                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1168         }
1169         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1170                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1171                 block = ufs_data_ptr_to_cpu(sb, p);
1172                 if (block) {
1173                         write_seqlock(&ufsi->meta_lock);
1174                         ufs_data_ptr_clear(uspi, p);
1175                         write_sequnlock(&ufsi->meta_lock);
1176                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1177                 }
1178         }
1179         read_seqlock_excl(&ufsi->meta_lock);
1180         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1181         read_sequnlock_excl(&ufsi->meta_lock);
1182         mark_inode_dirty(inode);
1183         mutex_unlock(&ufsi->truncate_mutex);
1184 }
1185
1186 static int ufs_truncate(struct inode *inode, loff_t size)
1187 {
1188         int err = 0;
1189
1190         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1191              inode->i_ino, (unsigned long long)size,
1192              (unsigned long long)i_size_read(inode));
1193
1194         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1195               S_ISLNK(inode->i_mode)))
1196                 return -EINVAL;
1197         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1198                 return -EPERM;
1199
1200         err = ufs_alloc_lastblock(inode, size);
1201
1202         if (err)
1203                 goto out;
1204
1205         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1206
1207         truncate_setsize(inode, size);
1208
1209         ufs_truncate_blocks(inode);
1210         inode->i_mtime = inode->i_ctime = current_time(inode);
1211         mark_inode_dirty(inode);
1212 out:
1213         UFSD("EXIT: err %d\n", err);
1214         return err;
1215 }
1216
1217 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1218 {
1219         struct inode *inode = d_inode(dentry);
1220         unsigned int ia_valid = attr->ia_valid;
1221         int error;
1222
1223         error = setattr_prepare(dentry, attr);
1224         if (error)
1225                 return error;
1226
1227         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1228                 error = ufs_truncate(inode, attr->ia_size);
1229                 if (error)
1230                         return error;
1231         }
1232
1233         setattr_copy(inode, attr);
1234         mark_inode_dirty(inode);
1235         return 0;
1236 }
1237
1238 const struct inode_operations ufs_file_inode_operations = {
1239         .setattr = ufs_setattr,
1240 };